presets: Add condition support for environment variables and cache variables and all non 'condition' preset variables

{
  "hidden": [
    {
      "condition": {
        "type": "equals",
        "lhs": "$env{PROCESSOR_ARCHITECTURE}",
        "rhs": "AMD64"
      },
      "value": true
    },
    {
      "condition": {
        "type": "notEquals",
        "lhs": "$env{PROCESSOR_ARCHITECTURE}",
        "rhs": "AMD64"
      },
      "value": false
    }
  ],
  "name": "program_files_x86",
  "cacheVariables": {
    "BUILD_TESTING": [
      {
        "condition": {
          "type": "equals",
          "lhs": "$env{PROCESSOR_ARCHITECTURE}",
          "rhs": "AMD64"
        },
        "value": "ON"
      },
      {
        "condition": {
          "type": "notEquals",
          "lhs": "$env{PROCESSOR_ARCHITECTURE}",
          "rhs": "AMD64"
        },
        "value": "OFF"
      }
    ]
  },
  "environment": {
    "CMAKE_PROGRAM_FILES_X86": [
      {
        "condition": {
          "type": "equals",
          "lhs": "$env{PROCESSOR_ARCHITECTURE}",
          "rhs": "AMD64"
        },
        "value": "$env{ProgramFiles(x86)}"
      },
      {
        "condition": {
          "type": "notEquals",
          "lhs": "$env{PROCESSOR_ARCHITECTURE}",
          "rhs": "AMD64"
        },
        "value": "$env{ProgramFiles}"
      }
    ]
  }
}

By using this, we can evaluate environment variable CMAKE_PROGRAM_FILES_X86 properly。 Should also take care of #22523

For general usage, I thinks all variables except "condition" should support "condition"。 That's is

          "name": string,
          "hidden": boolean,
          "inherits": string | string[],
          "vendor": string,
          "displayName": string,
          "description": string,
          "generator": string,
          "architecture": string,
          "toolset": string,
          "toolchainFile": string,
          "binaryDir": string,
          "installDir": string,
          "cmakeExecutable": string,
          "cacheVariables": {},
          "environment": {},
          "warnings": {},

          "errors": {},
          "debug": {},

And also for build/test may have more variables。 The reason to add condition on each cache variables and environment variables is for easily merge those variables. For final macro expansion.